This measure is published by Public Health England. It is based on a survey. The number is the percentage of respondents scoring 0-4 to the questions "Overall, how satisfied are you with your life nowadays".

Responses are given on a scale of 0-10 (where 0 is “not at all satisfied” and 10 is “completely satisfied”). The data shows the percentage of those scoring 0-4 (respondents in that area that scored themselves the lowest marks) in the question: 'Overall, how satisfied are you with your life nowadays?' .The smaller the percentage of residents not satisfied with their life, the happier residents are over all.